Vol. 1, Feb. 1884-Dec. 1889, was issued in 4 no. published 1886-90; v. 2, Jan. 1890-Dec. 1892, in 4 no. published 1891-93; v. 3, Jan. 1893-Dec. 1895, in 5 no. published 1894-96; v. 4, Jan. 1896-Dec. 1900, in 4 no. published 1896-1901; v. 5, Jan. 1901-Apr. 1903, in 4 no. published 1902-03; v. 6-19 (meetings of May 1903-June 1917) published quarterly, 1904-17 [i.e. 18]; v. 20- published monthly (exept July, Aug., Sept.) Jan. 1918-